Which of the following demonstrate the environmental advantages of secondary and tertiary treatment of wastewater? a) secondary treatment lowers the bod of wastewater making is safe to return to the environment. b) tertiary treatment removes excess nutrients such as nitrogen and phosphorus which can cause algae growth. c) disinfection is used to kill disease-carrying bacteria. d) all of these.

Dr. kaylan is an ecologist who studies bird behavior. she sets up an experiment to test which type of food crows are most likely to eat when given a choice between walnuts, corn, and sunflower seeds. to perform her experiment, dr. kaylan places three food bins in an area frequented by cows. each bin contains one of the three food types. then, she measures how much of each food type is eaten every day for a month and summarizes the results of her experiment in the pie chart below. based on her results, dr. kaylan concludes that crows choose to eat corn more frequently than other food sources because it has a higher nutritional value. what is a reasonable alternate conclusion that can be drawn from dr. kaylan's data

Out of the seven main animal groups (fish, mammals, birds, insects, reptiles, amphibians, and arachnids), how many contain members with internal backbones? a. 5 b. 3 c. 7 d. 1

The term equestrian relates to which animal? bulls cows horses pigs